knock-and-announce rule – officers must knock and announce their identity, authority, and purpose before entering a residence

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knock-and-announce rule:

1. Criminal procedure. The requirement that the police knock at the door and announce their identity, authority, and purpose before entering a residence to execute an arrest or search warrant. — aka knock-and-notice rule. [1]

1. The rule that a law enforcement officer may forcibly enter a house, whether to make an arrest or conduct a search, only if she has first identified herself as an officer and stated her purpose, and has been refused admittance. [2]

Notice: The no-knock search warrant may in certain instances provide an exception to the knock-and-announce rule:

no-knock search warrant – a type of search warrant that authorizes exception to the knock-and-announce rule because a prior announcement would probably lead to the destruction of the objects searched for or someone(s) safety.


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[1]: Black’s Law Dictionary Deluxe Tenth Edition by Henry Campbell Black & Editor in Chief Bryan A. Garner. ISBN: 978-0-314-62130-6

[2]:  Ballantine’s Law Dictionary Legal Assistant Edition
by Jack Ballantine 
(James Arthur 1871-1949).  Doctored by Jack G. Handler, J.D. © 1994 Delmar by Thomson Learning.  ISBN 0-8273-4874-6.


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